TECHNET Archives

June 2001

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Guy Ramsey <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 1 Jun 2001 17:09:25 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (64 lines)
From: Guy Ramsey [mailto:[log in to unmask]]
Sent: Friday, June 01, 2001 4:56 PM
To: TechNet E-Mail Forum.; Mary Jane Chism
Subject: RE: [TN] Exposed copper


IPC-A-600F states that this is a defect in all classes and requires
disposition. This specification is for boards before they are subjected to
the rigors of the assembly process.

IPC-A-610C states that Blisters/Flaking expose bare copper is a process
indicator for class 2 and 3. Meaning it merits attention and some form of
corrective action should be taken to prevent reoccurrence of the condition
but it is not a cause for rejection: Unless the condition affects the form,
fit or function of the product in its end use environment.

As a contract manufacturer you will probably need to discuss this matter
with your customer. As an OEM you would have to work with your engineering
staff to asses risk.

IMHO a decision like this should not be made based on a dogmatic
interpretation of the specifications. This is one of those areas where a
Black or White call may cost a significant amount of money and set
precedence that are far reaching.


Guy Ramsey
Senior Lab Technician / Instructor

E-Mail: [log in to unmask]
Ph: (610) 362-1200 x107
Fax: (610) 362-1290

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Mary Jane Chism
Sent: Friday, June 01, 2001 12:32 PM
To: [log in to unmask]
Subject: [TN] Exposed copper


I have a question concerning the subject matter of "exposed copper" on
conductors and/or ground planes due to missing solder mask. I have reviewed
the IPC-A-600 and SM-840 and have came to a conclusion on this. I want to
hear from the experts, which includes all of you, the interpretation of this
condition. I want to know if this is a defective condition or not, what
makes it defective, or if it is acceptable; anything you all want to tell
me. Thanks much.
Mary Jane Chism
Technical Trainer/ Learning Center
Kimball Electronics Group
Phone: (812) 634-4462
Fax: (812) 634-4501
email: [log in to unmask]

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------

ATOM RSS1 RSS2